DMAENGINE: extend the control command to include an arg
This adds an argument to the DMAengine control function, so that we can later provide control commands that need some external data passed in through an argument akin to the ioctl() operation prototype. [dan.j.williams@intel.com: fix up some missed conversions] Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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